Double-layer Cr/Cr2AlC coating for accident fault-tolerant fuel cladding and preparation method of double-layer Cr/Cr2AlC coating

A fuel cladding and coating technology, which is applied in the direction of metal material coating process, coating, reactor fuel elements, etc., can solve the problems of poor thermochemical compatibility and difficulty in meeting the needs of accident fault-tolerant fuel cladding coatings, etc.

Active Publication Date: 2021-09-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Double layer Cr/Cr 2 AlC coating, as a potential fault-tolerant fuel zirconium alloy cladding protective coating, can solve the problem of single-layer Cr 2 The therma

Method used

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  • Double-layer Cr/Cr2AlC coating for accident fault-tolerant fuel cladding and preparation method of double-layer Cr/Cr2AlC coating
  • Double-layer Cr/Cr2AlC coating for accident fault-tolerant fuel cladding and preparation method of double-layer Cr/Cr2AlC coating
  • Double-layer Cr/Cr2AlC coating for accident fault-tolerant fuel cladding and preparation method of double-layer Cr/Cr2AlC coating

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Preparation of Cr coating on Zry-4 zirconium alloy cladding tube substrate:

[0034] 1) Mechanically grind the base of the zirconium alloy cladding tube (use sandpaper to grind in the following order: 500 mesh → 1000 mesh → 1500 mesh → 2000 mesh → 2500 mesh → 3000 mesh), and then polish with diamond abrasive paste with a particle size of 3.5 μm , and ultrasonically cleaned with acetone and alcohol, respectively.

[0035] 2) Before the sputtering starts, the equipment is pre-evacuated to 6×10 -5 Pa, in order to minimize the pollution of residual gas during the sputtering process; then pass in high-purity argon (volume purity 99.999%), and adjust the working pressure to keep at 0.40Pa; then use Ar + The target is cleaned to remove contamination from the target surface.

[0036] 3) Using a Cr target (purity of 99.95wt%) as a sputtering target, a Cr coating was deposited on the surface of the zirconium alloy cladding tube. The Cr target power was 80W, the preparation tem...

Embodiment 2

[0038] Preparation of Cr coating on Zry-4 zirconium alloy cladding tube substrate:

[0039] 1) Mechanically grind the base of the zirconium alloy cladding tube (use sandpaper to grind in the following order: 500 mesh → 1000 mesh → 1500 mesh → 2000 mesh → 2500 mesh → 3000 mesh), and then polish with diamond abrasive paste with a particle size of 3.5 μm , and ultrasonically cleaned with acetone and alcohol, respectively.

[0040] 2) Before the sputtering starts, the equipment is pre-evacuated to 6×10 -5 Pa, in order to minimize the pollution of residual gas during the sputtering process; then pass in high-purity argon (volume purity 99.999%), and adjust the working pressure to keep at 0.40Pa; then use Ar + The target is cleaned to remove contamination from the target surface.

[0041] 3) Using a Cr target (purity of 99.95wt%) as a sputtering target, a Cr coating was deposited on the surface of the zirconium alloy cladding tube. Among them, the Cr target power was 130W, the pr...

Embodiment 3

[0043] Preparation of Cr coating on Zry-4 zirconium alloy cladding tube substrate:

[0044] 1) Mechanically grind the base of the zirconium alloy cladding tube (use sandpaper to grind in the following order: 500 mesh → 1000 mesh → 1500 mesh → 2000 mesh → 2500 mesh → 3000 mesh), and then polish with diamond abrasive paste with a particle size of 3.5 μm , and ultrasonically cleaned with acetone and alcohol, respectively.

[0045] 2) Before the sputtering starts, the equipment is pre-evacuated to 6×10 -5 Pa, in order to minimize the pollution of residual gas during the sputtering process; then pass in high-purity argon (volume purity 99.999%), and adjust the working pressure to keep at 0.40Pa; then use Ar + The target is cleaned to remove contamination from the target surface.

[0046] 3) Using a Cr target (purity of 99.95wt%) as a sputtering target, a Cr coating was deposited on the surface of the zirconium alloy cladding tube. Among them, the Cr target power was 100W, the pr...

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Abstract

The invention relates to a double-layer Cr/Cr2AlC coating for an accident fault-tolerant fuel cladding and a preparation method of the double-layer Cr/Cr2AlC coating. The protection capacity of the zirconium alloy cladding under the normal operation working condition and the accident working condition can be effectively improved by coating the surface of zirconium alloy with the double-layer coating. The double-layer Cr/Cr2AlC coating is deposited on the surface of the zirconium alloy by adopting a multi-target magnetron sputtering technology, the bonding between the coating layers and between the coating layers and a matrix is good, the total thickness is 4-10 microns, and the thickness range of the Cr2AlC coating is 3-8 microns. The double-layer coating integrates the advantages of the two coatings, and the Cr coating not only effectively relieves thermal stress between the coating and a zirconium alloy matrix, but also has the accident fault tolerance capability; the Cr2AlC coating not only has good oxidation resistance in a high-temperature water vapor environment, but also shows excellent fretting wear resistance in a high-temperature and high-pressure water environment under a normal operation condition of a reactor, and protects the zirconium alloy matrix from being oxidized in a high-temperature and high-pressure water corrosion process, and reliability and safety of operation of a nuclear fuel system can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of accident-tolerant fuel zirconium alloy cladding coatings, in particular to a double-layer Cr / Cr coating for accident-tolerant fuel zirconium alloy cladding 2 AlC coating and preparation method thereof. Background technique [0002] In the past few decades, zirconium alloys have been widely used in light water nuclear reactors as cladding materials of fuel elements or structural components in reactors due to their excellent mechanical properties, radiation resistance and corrosion resistance. However, when the reactor has an accident beyond the design basis, such as the three-mile island nuclear power plant in the United States in 1979 and the loss of water accident in the Fukushima nuclear power plant in Japan in 2011, the safety of the zirconium alloy cladding system is seriously threatened. In a water loss accident, the zirconium alloy will undergo a violent oxidation reaction with water vapor. When t...

Claims

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Application Information

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IPC IPC(8): C23C14/06C23C14/16C23C14/35C23C14/02G21C3/07
CPCC23C14/165C23C14/0635C23C14/025C23C14/352G21C3/07Y02E30/30
Inventor 张洁王京阳雷一明陈丽娜
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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